Fidget
The Destroyer
Title. I just noticed this while building a lifefruit farm, and I'm assuming it's the same for most other spreading things that aren't just grass. I know this is something basically nobody is going to run into often enough for it to be considered more than an annoyance, but it's got me thinking of a potential upgrade to the axe of regrowth that could maybe grow other grasses/moss on stone or dirt/mud.